Disable speculative evaluation in coreprep in ghc 9.4, 9.6, 9.8 #2662

Job	Run time
cabal	12s
cabal-doExactConfig	9s
nix-build	9m 15s
runghc	9s
unit-tests	7s
build-extra-hackages	7s
docs	39s
hix	5m 12s
hydra-ifdLevel-0-and-1	2m 46s
hydra-ifdLevel-2	13m 38s
maintainer-scripts	7s
multi-target	31s
plan-extra-hackages	6s
shellFor-hoogle	7s
shellFor-multiple-package	15s
shellFor-not-depends	12s
shellFor-single-package	14s
tests-benchmarks	10s
check-materialization-concurrency	25s
check-path-support	10s
closure-size	4s
haskell-nix-roots-do-not-require-IFDs	12s
hix-cabal	33m 3s
hydra-ifdLevel-3	31m 4s
hydra-without-remote-builders-ghc8107	3m 55s
hydra-without-remote-builders-ghc9101	3m 44s
nix-tools	10s
update-docs	9s
	1h 46m 52s

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